If a resistor Rx is connected between nodes X and Y, Ry between X and Y, Rz between Y and Z to form a delta connection, then after transformation to star, the resistance at node Y is?
(a) RzRy/(Rx+Ry+Rz)
(b) RzRx/(Rx+Ry+Rz)
(c) RxRy/(Rx+Ry+Rz)
(d) (Rz+Ry)/(Rx+Ry+Rz)
I had been asked this question during an online interview.
Query is from Star-Delta Transformation in section Useful Theorems in Circuit Analysis of Network Theory